Planetary Nebulae

Stars, with a mass of approximately 2 times the mass of our Sun, who burned all the available helium will contract their core and blow away the outer, hydrogen rich, layers in their last attempt to survive as a extremely hot blue dwarf star. This dwarf star and the outbursted layers of hydrogen form a "Planetary Nebulae". The outburst of the outer layers are once-only and at such a high speeds that the planetary nebulae exist for only 10000 years! Planetary nebluae represent the "life end stadium" of stars twice the mass of our Sun.

Planetary nebulae are classified according to the following sheme :

1. Stellar
2. Smooth disk (a, brighter center; b, uniform brightness; c, traces of ring structure)
3. Irregular disk (a, very irregular brightness distribution; b, traces of ring structure)
4. Ring structure
5. Irregular form similar to diffuse nebula
6. Anomalous form, no regular structure

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